Why is the latent period longer during an isotonic twitch of a skeletalmuscle fiber than it is during an isometric twitch?a. Excitation–contraction coupling is slower during an isotonic twitch.b. Action potentials propagate more slowly when the fiber is shortening,so extra time is required to activate the entire fiber.c. In addition to the time for excitation-contraction coupling, it takesextra time for enough cross-bridges to attach to make the tension in themuscle fiber greater than the load.d. Fatigue sets in much more quickly during isotonic contractions, andwhen muscles are fatigued the cross-bridges move much more slowly.e. The latent period is longer because isotonic twitches only occur in slow(type I) muscle fibers.

Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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Why is the latent period longer during an isotonic twitch of a skeletal
muscle fiber than it is during an isometric twitch?
a. Excitation–contraction coupling is slower during an isotonic twitch.
b. Action potentials propagate more slowly when the fiber is shortening,
so extra time is required to activate the entire fiber.
c. In addition to the time for excitation-contraction coupling, it takes
extra time for enough cross-bridges to attach to make the tension in the
muscle fiber greater than the load.
d. Fatigue sets in much more quickly during isotonic contractions, and
when muscles are fatigued the cross-bridges move much more slowly.
e. The latent period is longer because isotonic twitches only occur in slow
(type I) muscle fibers.

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